Detergent composition



atented J 10, i

MAURICE G TAYLOR, OF NIAGARA FALLS, NEW YORK, ASSIGNOR TO THE HATHIESOH ALKALI WORKS, INC OF NEW YORK, Y., A. CORPORATION OF VIRGINIA DETERGENT COMPOSITION Ho Drawing.

proportion of the calcium compound of hypochlorous acid and consisting mainly of a deter ent salt.

n the washing of dairy equipment such as I bottles, cans and milking machines and in the washin of equipment used in the preparation of Tood and containers for food products, for example, bacteriological cleanliness is as important as apparent cleanliness. The con ventional detergent salt mixtures are efi'ective to secure apparent cleanliness but not to secure bacteriologicalcleanliness. However, if the water solution in which such detergent salt mixtures are used includes but a small proportion such as one-twentieth part of an alkali metal hypochlorite, sodium hypochlorite, for example, the solution becomes effective to secure cleanliness in both respects. A proportion of hypochlorite suflicient to provide from 0.01% to 0.3% of available chlorine in the solution is suflicient for ordinary purposes. Sodium hypochlorite, however, is unstable to an extent such that its direct addition to such solutions of detergent salt mixtures is diflicult if not impractical. Moreover, the addition of an unstable compound of hypochlorous acid to a detergent salt mixture in the small proportion required is unsatisfactory because of the consequent uncertainty as to the effectiveness of the detergent salt mixture when used to secure bacteriological cleanliness as well as apparent cleanliness.

When dissolved, the improved detergent salt mixtures of the present mvention provide a solution containing the required small pro- Appllcatlon filed October 24, 1929. Serial No. 402,809.

portion of, for example, sodium hypochlorite, yet the dry detergent salt mixture, in which form it is kept until used, is free from uhstable components.

The invention will be further illustrated by the following example: 3 to 8 pounds of a stable calcium hypochlorite product containing from 6065% calcium hypochlorite, 35-30% sodium chloride and about 5% cal- .cium chlorate, calcium carbonate and calcium chloride, is mixed with 95 pounds of trisodium phosphate monohydrate to 'form a detergent salt mixture embodying the present invention. In general it is satisfactory to incorporate in the detergent salt mixture an amount of the stable calcium hypochlorite product such that the resulting mixture contains about one-twentieth part of calcium hypochlorite. This proportion, subject to variation.

The calcium hypochlorite products describedin United States Patents Nos. 1,481,- 039, 1,481,040, 1,713,650, 1,713,654, 1,713,668, 1,713,669, 1716,014, 1,718,284 to 1,718,287, both inclusive, and in applications Serial Nos.

300,148 and 308,885 are especially advantageous in the improved detergent salt mixtures of the present invention because of their stability and solubility.

As will be apparent, the detergent alkali metal salt should be substantially dry, that is, free from water available to effect the reaction between the alkali metal salt and the calcium compound of hypochlorous acid, before the minor proportion of the calcium compound of hypochlorous acid is incorporated in the mixture. If necessary, the detergent salt is dried before the calcium hypochlorite component is incorporated.

The detergent alkali metal salts used in the detergent salt mixtures of this invention are salts of acids forming insoluble calcium salts. Thus, when the improved detergent salt mixture of this invention is dissolved in water, sodium hypochlorite, for example, is formed in solution and the calcium salt corresponding to the detergent salt of the mixture is precipitated. Since the calcium hypochlorite, for example, reacting with the detergent salt to produce sodium hypochlorite, for example,

of course, is

a the solution is present in the mixture in m minor proportion onl a correspondingly mall proportion of the etergent salt is conumed in this reaction leaving the solution' riainl a solution of the detergent salt alhoug containing sodium hypochlorite, for 'xam le, effective to secure acteriological lean iness. The insoluble calcium salt preipitated is similarly present in but such small roportion that it can usually be disregarded. lhis precipitated calcium salt ma however, re separated from the solution 0 the detergent salt mixture by decantation or filtration f necessary or desirable.

I claim:

1. A detergent salt mixture forming in water a solution containing a water soluble letergent and a bactericide, the detergent bevng at least equal in amount to the amount )f the bactericide, said mixture comprising a water soluble detergent alkali metal salt of an icid forming an insoluble calcium salt and a. minor proportion, with respect to the alkali metal salt, of a stable calcium hypo- :hloride.

2. A detergent salt mixture comprising trisodium phosphate and a minor proportion of a stable calcium hypochlorite.

3. A detergent salt mixture comprising an alkali metal hos hate and a minor proportion of a stab e ca cium hy ochlorite.

4. A detergent salt mixture formin in water a solution containing a water so uble detergent and a bactericide, the detergent being at least. equal in amount to the amount of the bactericide, said mixture comprising an alkali metal carbonate and a minor pro ortion, with respect to the alkali metal car onate, of a stable calcium hypochlorite.

5. A detergent salt mixture forming in water a solution containing awater soluble detergent and a bactericide, the detergent being at least equal in amount to the amount of the bactericide, said mixture comprising an alkali metal silicate and a minor proportion, with respect to the alkali metal silicate, of a stable calcium hypochlorite.

6. A detergent salt mixture formin in water a solution containing a water so uble detergent and a bactericide, the detergent being at least equal in amount to the amount of the bactercide, said mixture comprising an alkali metal phosphate and a minor proportion, with respect to the alkali metal phosphate, of a stable calcium h pochlorite.

In testimoriyfivhereof I a ray si nature.

. MA ICE CRAIG A OR. 

